This category includes mineral colors of powder which, depending on the composition, are divided into oxides of iron and chromium.

Cold process soaps do not dissolve in water, they need to be dissolved in oil to incorporate (1 tsp powder into 3 tsp oil, eg almond oil).

Glycerin soaps are dispersed in liquid vegetable glycerin in the same proportion as above.

While in bath bombs they are dissolved as they are.